Issue link: http://itf.uberflip.com/i/428396
17 ii. Wheels may have a single pushrim only. No changes to the wheelchair that afford the player a mechanical advantage are permitted, such as levers or gears. During normal play, wheels shall not leave permanent marks on, or otherwise damage, the court surface. iii. Subject to Rule e(v), players shall use only the wheels (including pushrims) to propel the wheelchair. No steering, braking or gearing or other device that may assist operation of the wheelchair, including energy storage systems, is permitted. iv. The height of the seat (including cushion) shall be fixed and players' buttocks shall remain in contact with the seat during the playing of a point. Strapping may be used to secure the player to the wheelchair. v. Players who meet the requirements of Rule 4.5 in the ITF Classification Manual may use a wheelchair powered by electric motor(s) (a "powered wheelchair"). Powered wheelchairs must not be able to exceed 15 km/h in any direction and shall be controlled by the player only. vi. Applications may be made for modifications to the wheelchair for legitimate medical reasons. All such applications shall be submitted to the ITF Sport Science & Medicine Commission for approval a minimum of 60 days prior to intended use in an ITF-sanctioned event. A decision to reject a proposed modification may be appealed under Appendix A of the ITF Wheelchair Tennis Regulations. f. Propelling the Chair with the Foot i. If due to lack of capacity a player is unable to propel the wheelchair via the wheel then he may propel the wheelchair using one foot. ii. Even if in accordance with rule e) i. above a player is permitted to propel the chair using one foot, no part of the player's foot may be in contact with the ground: a) during the forward motion of the swing, including when the racket strikes the ball; b) from the initiation of the service motion until the racket strikes the ball. iii. A player in breach of this rule shall lose the point. g. Wheelchair/Able-bodied Tennis Where a wheelchair tennis player is playing with or against an able-bodied person in singles or doubles, the Rules of Wheelchair Tennis shall apply for the wheelchair player while the Rules of Tennis for able-bodied tennis shall apply for the able-bodied player. In this instance, the wheelchair player is allowed two bounces while the able-bodied player is allowed only one bounce.